GRE Text Completion Question 402

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Source: XDF

A major tenet of the neurosciences has been that all neurons (nerve cells) in the brains of vertebrate animals are formed early in development. An adult vertebrate, it was believed, must make do with (i)_____neurons: those lost through (ii)_____or injury are not replaced, and adult learning takes place not through generation of new cells but through (iii)_____among existing ones.

A a fixed number of D revolution G reproduction of older ones
B abundant E disease H modification of connections
C minimal F generation I generation

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